Switchboard-mounting.



snares PATENT cri ics.

'W. SCIIRAMM, OF RIVER/TON, NEW JERSEY, ASSIG-NOE TO ELECTRO DENTAL EANUFAGTURING CQHPAJATY, 0F PHILADEQPHZA, BEN FI'SYLVANIA, A CORPORA- TZON SF PENTBI'EYLVANIA.

SWITCHBGARD-E'IOUTDZ'TING.

Specification of Letters Patent.

Application filed December 20, 191:2. Serial No. 737,87.

other switchboard, which will permit of such board being conveniently and substantially mounted on an uneven or warped wall for example, without danger of cracking or straining the marble or other slab forming part of said board; the invention further =contemplating a construction which shall meet the underwriters requirements as to the provision of a metal backin spaced away from the wall, and which siall also be conveniently removable for purposes of inspection or alteration.

I also desire to provide a novel form of switchboard mounting, particularly of the type employed in dental switchboards, which shall include means whereby the resistance for certain of the electric apparatus mounted on or controlled from the switchboard shall be conveniently supported so as not to materially interfere with the free access to the various terminals and connections On the back of the board and which at the same time shall be relatively compact as well as substantial.

Another object of my invention is to provide a novel form of switchboard mounting designed to so support the resistance for heaters, motors, or the like, that it may occupy either of two'positions, in one of which free access may be had to the back of the switchboard while in the other it lies close to the body or" the switchboard so as to occupy'a minimum of space; the said re sistance being supported on a special structure designed to allow of convenient access to the same.

The invention also contemplates av novel supporting structure shall, under operating conditions, be called upon to dissipate substantially equal amounts of heat.

A further object of the invention is to provide a novel form of switchboard mounting which shall include a body of 'movably supported resistance capable of being swung into a position immediately adjacent the back of the board or into a position relatively distant therefronrwithout interfering with Or requiring change of its electrical connections.

Another object is to provide a relatively light and flexible supporting structure which may be securely mounted on a wall of uneven or warped surface and on which a switchboard may be detachably supported and secured without strain or risk of breaking its marble panel.

hese objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1, is a rear elevation of a switchboard showing its interior as constructed and arranged according to my invention; the resistance casing being swung to its outer position; Fig. 2, i a rear elevation, similar to Fig. 1, illustrating the resistance casing in its closed position; Fig. 3, is a vertical section on the line a-a, Fig. 2, but with the supporting plate in position; Fig. 4c, is a horizontal section on line b-b, Fig. 3, and, Figs. 5 and 6, are fragmentary elevations Showing the construction of the supporting plate.

In the above drawings, 1 represents a suitable supporting frame in the form of an open, elongated rectangle, to one face of which is bolted a slab or panel 2 of marble or other insulating material for the reception or the various electrical mountings, terminals and connectors. This frame at its top is provided with two holes 3 for the reception of a. pair of pins 4 carried by a reinforcing piece 5 riveted 6r otherwise suitably fixedto a flexible metallic plate 6 forming the body ofa back plate for the rear face of the switchboard structure. The opposit/e end of this plate 6 is likewise provided with a reinforcing piece f? having a lug 8 provided with vertically extending hole for the reception of a locking bolt 9 which may be screwed through the bottom of the frame 1. The various parts of this back plate 567 form a mounting structure that is rigidly fastened to the wall and upon which the switchboard may be removably mounted, being so arranged that by removing the bolt 9 the lower end of the switchboard frame 1 may be swung outwardly clear of the reinforcing piece 7 and may thereafter be lifted up so as to dis-engage its upper part from the pins 4, thus freeing the switchboard from its back plate and exposing its rear face.

Mounted upon one side of the frame 1, between the slab 2 and rear cover 6, preferably adjacent the top and bottom thereof, are two members 10 and 11 for the reception of a pivot rod 12 on which is slidably and rotatably mounted a flat resistance inclosure or casing 13, whose width is preferably slightly less than the distance between the side members of the frame while it may be of any desired length. This casing as shown in Figs. 3 and f, is constructed, in the form of a flat plate having edge flanges 25 extending completely around it so as to form two relatively shallow containers 26 and 27. In each of these is mounted the resistance material, which in the present case, consists of a number of plates 13, 13 13 of insulating material on which is wound wire of the desired electrical resistance and which are suitably supported in one of the containers, while the second container holds a similar insulating plate 13, likewise wound with wire having a suitable resistance. These two resistance containing chambers are respectively covered by sheet metal plates 13 and there are a number of electrical conductors extending from various points of the bodies of resistance to the different sets of terminals 14, 15, 16, 17 and 18 which are designed to be connected by suitable flexible conductors (not shown) to other terminals, also omitted, on the rear face of the slab 2 of the switchboard. The resistance casing 13 is usually held in the position shown in Figs. 2 and 3, by means of a screw 19, which engages a suitably formed lug 20 carried by that side of said casing opposite the one having the pivot rod 12 and the members 10 and 11. \Vhen the switchboard is removed from the supporting back plate 6 as above described, the screw 19 may be taken out and the resistance casing 13 turned on its pivot rod from the position shown in Fig. 2 to the position shown in Fig. 1, thus very completely exposing the rear of the panel or slab 2.

It is to be noted that the resistance terminals 15-18 are immediately adjacent the edge of the casing 13 so that even though they are connected to terminals on the slab or panel 2, the swinging of said casing on its pivot rod does not materially affect the conductors, which are flexible and of a suitable length.

It is to be noted that the body portion 6 of the back plate is spaced away from the plane of the back faces of the reinforcingor end pieces 5 and 7 so that there is a suitable space between the wall against which the switchboard is mounted and. said plate, as required by the fire underwritersl Moreover, in mounting the switchboard, the flexibility of the body 6 of the back plate permits the latter to be fixed on rough and un even wall surfaces without interfering with its availability for properly carrying on its pins 4 the switchboard frame with its parts. These supporting pins not only provide a most convenient and simple form of support, but as above noted, cooperate with the bolt 9 to securely and rigidly hold the switchboard in place while permitting its removal in a minimum time and with minimum labor.

It is to be noted that the bodies of resistance 13, 13 13 and 13 are so connected to the various electro receptive devices with which they are associated, that under operating conditions the resistance in one of the two chambers of the casing is called upon to dissipate substantially the same amounts of energy as is that in the other chamber, thus distributing the heating in manner tending to most quickly get rid of it.

I claim 1. The combination of a frame; a switchboard panel mounted thereon; with a resistance-containing structure pivotall-y mounted on said frame and free to swing toward and from said switchboard panel.

2. The combination of a hollow frame; a slab of insulating material mounted thereon; a back plate for the frame co-acting therewith and with the slab to form a contalner; and a resistance containing structure movably mounted on the frame within said container.

3. The combination of a hollow frame; a

. slab of insulating material mounted thereon;

a removable back plate cooperating with said frame and with the slab to form a container; and a resistance containing structure movably mounted within said container and free ti) lswing toward and from said insulating s a 4c. The combination of an open frame; a slab of insulating material on one face of the frame; a back plate removably mounted on the opposite face of said frame; and a resistance containing structure movably mounted on the frame between the back plate and the insulating slab.

5. The combination of an open frame; a slab of insulating material on one face of the frame; a back plate having pins fitting recesses in the frame and cooperating therewith to form a container; means in addition to said pins for removably holding theback plate in position; and a resistance containing structure pivotally mounted between the back plate and said slab.

6. The combination of a supporting back plate; a frame detachably mounted thereon; a switchboard slab mounted on said frame; and a resistance containing structure hung to the frame between said back plate andand a device. for separately connecting the lower parts of the back plate and of the switchboard structure.

10. The combination of a supporting back plate having a plurality of pins on its upper part; a switchboard structure having recesses in which said pins removably fit; and a device for removably connecting the lower parts of the back plate and of the switchboard structure.

11. The combination of a back plate consisting of two relatively rigid ends and a flexible plate connecting the same; a supporting pin or pins on one of said rigid ends; a switchboard structure having re cesses for the reception of said pins; and means for removably connecting the second of said ends and the switchboard structure. In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

ADOLPH W. SCHRAMM. Witnesses:

TILLIAM E. BRADLEY, WM. A. BARR. 

